Road finishing machine



NOV. 24, R w BRIGGS ROAD FINISHING MACHINE 4 Sheets-Sheet 1 Filed Sept. 9, 1950 BIKE/4 5 Nov. 24, 1931. R. w. BRIGGS ROAD FINISHING MACHINE Filed Sept. 9, 1930 4 Sheets-Sheet 2 A NF a l I P P Q NMN urvllllk 11k llll 5 AN R Nov. 24, 1931.

R. W. BRIGGS ROAD FINISHING MACHINE 4 Sheets-Sheet 5 Filed Sept. 9, 1950 gwumto'a f R. Briggs Till--- Nov. 24, 1931. R. w. BRIGGS ROAD FINQISHINGMACHINE Filed Sept. 9, 1930 4 Sheets-Sheet 4 I Clbtomq Patented Nov. 24,1931

r normal: raises,orjrnanratrnxas "noen rimsmne MACHIYNY'E" l Application med September 9, 1930. Serial no. 4so;771.f v t l This invention relates t o aroad finishing machine, and more particularly'to a machine adapted to strike off and smooth Concrete, asphalt or other pavingv material laid between forms located at the sides andeXtending longitudinally of a road. a p

The invention has for one of its ob ectsto provide machine of the character stated which shallembody a carriage adapted to I mounted upon and travel along the forms; and i d the l1ne'7-7 of Figure 1; I

a screed. supported solely'by thecarria-ge an governed thereby in a manner toautomatically smooth out all the irregularities in the paving material. Y

The invention'has fora further objectto provide a machine of'the character stated wherein the screed shallbe mounted on the carriage for vertical adj ustment with respect to the paving material, and which shall embody screed adjusting means adapted to'be controlled by the forms to effect the raising of the screed-when low places in the forms are encountered and to effect the lowering of the screed when high places in the forms are encountered, to the end that "low places the paving material maybe filled and high places therein smoothed off.

The invention/has for furtherobject to provide a machine of the character stated which shall embodymeans adapted to maintain the screed in a constant state ofvibration, to the end that the screed may be moved smoothly. and evenly over the'pavingmaterial.

With the foregoing and other objects in view, the nature of which will appear as the description proceeds, the invention consists in the construction, combination and arrange ment of parts hereinafter fully described and claimed, and illustrated in the accompanying drawings, wherein 3 1 r V Figure 1 is a top plan view of a road finishing machine constructed in accordance with my invention; e

Figure 2 is a View in side elevation of the machine;

the line 3-3 of: Figure 1; i t Figure 4 is a sectionalview' on'an 'enlarged for setting the screed; and

scale taken on the horizontal planeindicated by the line of Figurell;

Figure 5 is a sectional new on an enlarged scale taken 'on the vertical plane indicated by A the line 55- f Figure l Figure-6 is a sectional-view on an'en'la rged scale taken on the vertical plane ind'cated by the line 6 6 of Figure I; Figure 7fis-a sectional scaletaken' on the vertical plane indicated-by Figure 8 is a View similar snare-7111a. trating 'a slightly modified form of; the means Figure 9 is a sectional view tak n, the vertical plane indicatedby-th 1ine 9;" .9 f Figure 8. 7 1

a'long theforms'; designated 2, between which concrete and the-like paving material is laid. The carriage 1 comprises foursimilar trucks 3 two ofwhich are mounted in longitudinally view on an enlarged" w "The machine comprises 'acarriagel which I is'adapted to be mounted upon and travel spaced relation upon oneof the forms 2 and the other two of whichare'similarly mounted upon the other form, Each'i'of the trucks 3 comprises a pair 'ofwheels 4 havingfianges contacting with the outer sides of the forms 2', axles 5,.and beams 6 supported at their ends on the axles. The beams 6 are arranged in parallel relation'tothe forms 2, and beams v 7 located above and arranged in paralleljre'a lation to the beams 6 are pivotally connected at theirendfs, as at'8,tothe transverse centers of'the trucks 3. l The beams 7 connect the trucks '8, and maintain the trucks of each pair 1n proper spaced relation. The pivots 8 connecting the beams 7 toIthefbeams 6,"extend horizontally and transversely of the trucks 3 to perimitthe trucks to move independently and'thus follow any irregularities in the forms 2. A frame 9'locat'ed between i the beams 7 is secured to the beams centrally between the ends of the latter, and braces 10 extend from theends of the beam to 0 sides of the frame 9. e Figure 3 1s a sectional View on an enlarged scale taken on the vertical plane indicated by Shafts 11 and 12 extendlongitudinally of the frame 9 at opposite sides of the. longitudinalcenter of the frame,' the shaftllbe ing' journaled bearings '13 carried'zby the Rods-.17 arrangedtransversely of the frame 9, extend fromQtheQ shaft 12 to; the arms 16. The rods 17 are provided with bearings 18 for the shaft 12, and are pivotally connected,

as at 19,to thearms16i Therocki ngmovement of the eccentric straps 15 and their arms 16 is limited by arouate'stops2O- which are carried by plates '21fiXed, as at 22, to the frame 9. The stopsf20surroundthe e'ccen tric straps l-t'), and( the arms-16 of the eccentric straps are arranged: between the ends of the stopsand cooperate 'therewitilrto limit 26 theroeking movement of the eccentricstraps andarrns.

- The shaft, 12 has-itsterminalportionsiofi ,setgr'adially to provide cranks23-which: are

loosely arranged'in" slots 2'4l3zfformed in the 'ends-of' equalizing,- bars or levers 25.which extend from the cranks in the general direction of'the shaft 11.. The levers 25am arnangediin p airs, and the levers of: each pair .arepivoted centrally between their ends, as at 26, to the lower. ends of brackets 27, eX-- tending downwardly from the beams 9. -;The 'brackets27 are located in a plane located between the longitudinal center of: the canriagel and; theshaft "12.. Axles 28;-are' carried. by the.- other' ends'of; the levers-..25,,and lOurnaled thereon are balance wheels 29 adapted to rest .uponand; travel! along; the forms2.. f

-A. screed 30 located in the longitudinal center of the carriage 1 is secured, as at 31, to thelower ends of arms 32- extending? :downe :wardly from the arods17. which. arereinforced by braces '33. An upright hand leverBL-is pivotediat its lower end, as at 35,,tothe frame 9, ilIlddSgPIOVlClGd at itslower, end with an armi36.

. An; arm 37 connected tothe-shaft112,as at .38, is .connected to, the arm 36 by a. link 39. The.) lever 34 is: provided Witha latch: 40 engaging anotched' sector 41' securedgto the frame9; Asits cranks-'23 are journal'edin the lovers 25,;theshaft 12. is supported by 1e:- versgfor. rocking movement toward! and! away fnom'the paving material, and asthescreed i supporting; rods .17 are pivoted! to the eccentmicstrap arms-.16 and connected to theshaft, the rocking.- of the shaft in the direction.- of the -paving material lowersthescreed 30 and the rocking, of the shaft-away from thepaving: materialeraises the screed... The shaft 12: is-{adapted to be rocked through the me dium of thelever 34, and it isadapted tobe secured-imthe position into :which it is rocked by. the latchAO and-notchedisector 41.. 'It will thus be s seeni that the screed 30 may beadjusted into; the proper position with respect .balance'wheels over low or high places in the forms 2, and the screed is adapted-to be main' tained in this positionby the balance. Wheels 7 while. they'are passing-over level'portions of theforms. During the passing of the balance wheels 29 over low places in the forms 2,.th'e1levem-E253iane rocked in a direction to raise the shaft 12 and with it the screed 30,

- 'wit'h the resi-i-lt that the paving material accu mulated in front of the screed will drop into 'low' pl'aces in' the paving material; During theapassagei of the. balance, wheels 29 "over high placesdn'the form's 2,.the levers 25 will bejrocked in. a. [direction to lower the shaft 12. and withit lthe screenJ30,.withj the result that lii gh. places in. the I pavingmaterial. will bestruckoff. 131 i A. power plant 42, whichmay consist'off an internalcombustion engine or. th e' like. is mountedlupon the. frame j The'shaft; 11 is driven. at. hi h speed from thepo-wer plant 42,.throught e. medium yer. at sprocket chain 43) passing about a sprocket wheel: 4:4; fixed to. the; shaftv and a sprocket. Wheel; 415 fixed to the driving shaft 46 of'th'epowerplantj. A sathe screed supporting rods 17. are'oo-nnectedltotlie shaft, ll'througli the medium of the eccentrics. 14,.thes'creed v30 will be rap idlly vibrated, with. the result thatjit may be moved smoothly and evenly. over the. paving mate'riall,

"with respect to the pinsjto enable the balance whe'els.29'to raise andjlower the screedfrom its set position. 7 e

From the foregoing. description,fltaken in connection with the accompanyingdraw-ings, it. will be understood. that the screed {30 may be-set to st'rike off the desired amountof' the surface ofthe paving material, thatthe screed is-.--maintained in its set or normal-position while the balance, wheels 29 arep'assingover "level' stretches of t-heforms '2, and that the screed will be raised when th'e balancewheels encounter lowplaces in the forms andlowered when t hey encounter high'places in the forms. with the result that a uniform'andsmooth surface-is imparted: to the paving material. The position of the pivot 26 of each equalizingbzin-orslever-Qfi with: respectzto 'the pivots 8: of theadjacent I trucks, is; such; that the motion of the screed 30upwardly anddown wardly will beitlhe correct-amount to takeout the forms fonmoveinenti in the "direction-of the length thereof, ashaft journaledomthe a shaft extendingltransversely of'thefpaving carriage and' extending L transversely ofJthe paving material, means for rotating the shaft, "eccentricsfixed to the shaft and provided with-straps, rodsextending longitudinally of thepaving material and pivotallyconnected at certain ends thereofto the eccentricstraps,

' with openings receiving the cranks, balance wheels ournaled on the other ends of the-1evers and adaptedto travel upon thev forms,

7 ascreed suspended fromthe rods, a hand leverpivoteduponithecarriageand provided with an arm, a-sec'ond arm connected to'said I horizontal pivots; a screed, means support second shaft and connected to said first arm, and means adapted 'torhold the leveraga'lnst accidental movement; 4

8. A machinefor: {finishing the surface of pavingmaterial laid between forms,rcompris- I ingipairs oftrucks,-eachzpair of trucks being adapted" to be mounted upon each form for movement in' the direction of the length thereina-frame mounted upon andzpivot'ally'se cured to 'the trucks adapted to eiitend' across the paving -mat'erial, rods extending trans- .verse'ly of the frame; and pivotally' connected at certain ends thereof to'the frame, a: shaft extending longitudinally. of" the frame and journaled in thefree ends of the rods and terminallyprovidedwith cranks, levers pivoted to the' frame and extending transversely thereof and provided at certain ends thereof Vltli openingsreceiving' the cranks, balance Wheels journals-d in-the other endsof thele vers and adapted to travel upon the'forms, and a screed suspended from therods;

" 9. A machine for finishing-the surfaceof i paving-material laid between for-ms, comprising pairs of trucks, each pair of-trucks being adaptedato be mounted upon'each form for movement "in the direction of the length T thereof,a frame mounted upon and pivotally A extending: longitudinally of the frame and secured to the trucks adaptedito entend acros's the paving material, rods extending? transversely of the 'frame and pivotally connected atcertain ends thereof to theframe, a shaft journaled in: the free ends of t-he'rOdsand terminally provided With cranks, levers .pivoted to the frame and extending transversely thereof and provided at certain ends thereof with openings receiving the cranks, balance Wheels journal'ed'in the otherends of the levers and a'daptedto travel upon the forms,

ascreed suspended from" th V means for turning the shaft to effect the settingof the screed.

V j 10 A machine forfinishing the surface of paving materialqlaid between forms, com- .prisingafpair of trucks for-.movementrlon j.

- igsssasev 'gitudinall'y on one of the forms, a: pair, of trucks for movement longitudinally on the other form; l the trucks on each form being movable independently andithe trucks on one lfor'm being movable independently ofthose on the other form'by irregularities in the .forms3ia frame'conne'cted to the trucks'by horizontal pivots, and a solely from I the frame.

screed supported 11; A machine for finishing the surfacevof paving material laid between forms, comiprisingra: pair of trucks for movement longitudinally' on one .ofthe forms, a pair of trucks, for movement longitudinally on the other form, the trucks on each form being 51 movable independently and the trucks on one form being movable independently of those on the? other form'by irregularities in-the forms, aiframe zcon'nected to the trucks by in'g'the'screed from the frame and operable to effect the vibrationsof Jthe screed,f a nd means for operating-said first-means.- n

12. A machine:for-finishing the surface 0 paving material laid between forms, compris- 7 ing carriage fonmovement longitudinally H onthe forms, a'scre'ed, and means supporting tudinally on one ofth'eforms', a pair of'trucks for movement longitudinally on theother 7 form, the trucks on eachforni being movable independently and the trucks onone 'form being' movable independently of those on the other form: by irregularities in-thevforms, a frame-connected to the trucks-by horizontal pivots,a--s creed, and means supporting the screedin set position from thegframe andoperable bythe forms'toraise the screed at low portions of: theforms andto lower thescreed v at highrportions of the forms.

14. A machine. for finishing. the surface of I paving material, comprising a carriage, rods pivoted, atcertain ends thereof to the.car riage,;means connected to the other ends'of the rods and operable to rock: the rods, means for operating said firstflm eans,;an d a screed supported the rodsf A 15; Amachine for finishing'the surface of 7 paving material, comprising a carriage, rods pivoted at certain endsfthereof to the carriage, means connected to the otheriends of the rods and operable torockthe rods, means for operatingsaidiirstmeans, a screed, and

, means securingthe screed to the arms for adjustment with respect thereto: 7 n testimony Whereofl hereunto aflix my signature. V r V or RQBERT 

